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My thermocouple is in the up pipe (pre-turbo). My TTM is set for 300°, so the engine dies at 300°. That usually takes about 60 seconds when unloaded or two to three minutes when towing at highway speeds (74 MPH unloaded or 62 MPH towing). If I don't turn off the key, mine will very slowly cool off to around 280°. If I crank it cold and immediately let it idle, it begins at about 275° but slowly warms up to about 280°.
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My Sierra Blanca in the sig pic was a great pickup for 11.5 years. I sold it last year. Replacement is a 2012 F-150 EcoBoost SuperCrew Lariat.
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